Journal
BLOOD
Volume 107, Issue 2, Pages 558-565Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2005-05-2152
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Funding
- NHLBI NIH HHS [HL-70937, HL-65578] Funding Source: Medline
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In vivo, bromide (Br-), nitrite (NO2-), and thiocyanate (SCN-) compete for oxidation by eosinophil peroxidase (EPO) and H2O2, yielding, respectively, HOW, NO2., and HOSCN. We have recently shown that SCN- is the strongly preferred substrate for EPO in vivo and that HOSCN, in contrast with other EPO-generated oxidants and HOCl, is a relatively weak, cell-permeant, sulthy-dryl (SH)-reactive oxidant. We here show that HOSCN is a uniquely potent (up to 100-fold) phagocyte oxidant inducer of tissue factor (TF) activity in human umbilical vein endothelial cells (HUVECs). This induction is attributable to transcriptional up-regulation of TF gene expression dependent upon both activation of the p65/c-Rel TF-kappa B transcription factor and activity of the ERK1/2 kinase pathway upstream of Egr-1 and was markedly further enhanced in the presence of wortmannin, an inhibitor of the PI3 kinase/Akt pathway. HOSCN also markedly activates the proinflammatory p65/p50 NF-kappa B pathway. Based on these findings we hypothesize that HOSCN generated by adherent and infiltrating eosinophils may provoke the development of a prothrombotic and proinflammatory endothelial/endocardial phenotype that promotes the pronounced thrombotic diathesis characteristic of the hypereosinophilic syndrome.
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